I have one ceiling pot light in my sauna and I noticed the electrician is using a plastic vapour barrier extension behind it. I feel this is wrong given it’s on the ceiling and it’s a few feet to the side of the electric heater. My concern is plastic melting and off gassing. What other type of backing for this pot light do you recommend? I’d like to show the electrician the alternative.
Do you have details about the exact material? “Plastic” doesn’t really say much - plus you don’t really have to worry about the melting point, but the glass transition temperature. That’s the temperature at which it loses stability, which can be more than 100°C away from its melting point. Depending on the type of plastic and additives you’re looking at a range of roughly 50°C to 400°C for the glass transition temperature - and I’m assuming that kind of part needs to have a relatively high rating for fire safety reasons. So, try to get the datasheet for that thing.